I finally managed to get it to work. So I made both parent and child go outside the house, I made sure that the child had the bike in her inventory and I told the parent to teach how to ride bike, I was previously getting the child to ask the parent to teach her how to ride, so I don't know if the bug occurred because of that. As with others here I've had the action cancel and both sims stand doing nothing, even when outside and the bike in the child's inventory but I kept trying because the child has the mind and body aspiration and needs to learn to ride the bike for that, so I don't know what was causing the issue. Hopefully it works for others.
